Coupled Eulerian-Lagrangian simulation of a modified direct shearapparatus for the measurement of residual shear strengths

作     者：Luke Tatnell Ashley P.Dyson Ali Tolooiyan Luke Tatnell;Ashley P.Dyson;Ali Tolooiyan

作者机构：GHD Group Pty.Ltd.TraralgonVIC3844Australia School of EngineeringUniversity of TasmaniaHobartTAS7001Australia 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2021年第13卷第5期

页      面：1113-1123页

核心收录：

学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：Earth Resources Regulation of the Victorian State Government Department of State Development , Business and Innovation, Australia Earth Resources Regulation of the Victorian State Government Department of State Development, Business and Innovation, Australia Monash University, MU Federation University Australia, FedUni 

主　　题：Coupled Eulerian-Lagrangian(CEL)simulation Residual shear strength Multi-stage Direct shear(DS) Organic content Cohesive soil 

摘      要：The simulation of large-strain geotechnical laboratory tests with conventional Lagrangian finite element method(FEM)techniques is often problematic due to excessive mesh *** multiple reversal direct shear(MRDS)test can be used to measure the residual shear strength of soils in a laboratory ***,modelling and simulation generally require advanced numerical methods to accommodate the large shear strains concentrated in the shear *** reality,when the standard direct shear(DS)apparatus is used,the MRDS method is prone to two major sources of measurement error:load cap tilting and specimen *** sources of error make it difficult or even impossible to correctly determine the residual shear *** paper presents a modified DS apparatus and multi-reversal multi-stage test method,simulated using the coupled Eulerian-Lagrangian(CEL)method in a finite element *** method was successful in evaluating equipment and preventing both load cap tilting and specimen loss,while modelling large-deformation behaviour that is not readily simulated with the conventional FEM or arbitrary Lagrangian-Eulerian(ALE)***,a modified DS apparatus was created for the purpose of analysing mixtures of organic materials found in an Australian *** results obtained from the modified DS CEL model in combination with laboratory tests show a great improvement in the measured residual shear strength profiles compared to those from the standard *** modified DS setup ensures that accurate material residual shear strengths are calculated,a factor that is vital to ensure appropriate soil behaviour is simulated for numerical analyses of large-scale geotechnical projects.